Sperm shape plays an important role in male fertility. Healthy sperm usually have an oval head and a long tail that helps them swim toward an egg.
When a high percentage of sperm have an unusual shape, the condition is called teratospermia, also known as abnormal sperm morphology.
Teratospermia can affect how sperm move, reach an egg, and fertilize it. However, an abnormal sperm shape does not automatically mean a man cannot have children.
Understanding the causes, diagnosis, and available treatments can help couples make informed decisions about their fertility.
Teratospermia is a condition in which a large proportion of sperm have an abnormal shape or structure. Doctors assess sperm morphology through a semen analysis, which examines the size and shape of sperm under a microscope.
According to strict morphology criteria, 4% or more normally shaped sperm is generally considered within the reference range.
A lower percentage may indicate abnormal sperm morphology. However, this result must be interpreted alongside sperm count, motility, and other fertility factors.
Sperm morphology can affect a sperm’s ability to reach and fertilize an egg.
For example, an irregular head may interfere with egg penetration, while tail abnormalities can affect movement.
However, morphology is only one part of male fertility. Some men with a low percentage of normally shaped sperm can still conceive naturally.
Fertility also depends on sperm motility, sperm count, reproductive health, and the female partner’s fertility.
Sperm abnormalities can affect different parts of the sperm:
Several factors can contribute to abnormal sperm morphology, including:
In some cases, no clear cause is identified.
Teratospermia usually causes no noticeable symptoms. Most men discover it during a fertility evaluation or semen analysis.
Some men may have an underlying condition, such as a varicocele or hormonal problem, that causes testicular discomfort or other symptoms. However, these symptoms do not directly confirm abnormal sperm morphology.
A semen analysis is the main test used to assess sperm morphology. A laboratory examines a semen sample to measure the percentage of normally shaped sperm.
Doctors may recommend repeating the test because sperm quality can vary over time.
Depending on the results, further evaluation may include a physical examination, hormone testing, or tests for infection.
Severe sperm abnormalities may reduce the chances of natural conception, especially when combined with low sperm count or poor motility.
However, an abnormal morphology result alone cannot reliably predict whether a couple will achieve pregnancy.
The overall fertility assessment, including the female partner’s age and reproductive health, helps determine the most appropriate next steps.
Treatment depends on the underlying cause. A fertility specialist may recommend treating an infection, managing a varicocele in selected cases, or addressing a hormonal disorder when appropriate.
Lifestyle changes may also support sperm health. However, there is no single medicine that reliably corrects all sperm shape abnormalities.
Healthy habits may support sperm production and overall reproductive health. Men can consider:
Antioxidant supplements may help some men, but evidence is mixed. Consult a gynaecology clinic before taking supplements.
If natural conception is difficult, several fertility treatments may be considered:
The best option depends on the couple’s complete fertility assessment.
Sperm production takes approximately 74 days, followed by additional time for maturation and transport. As a result, changes in lifestyle or treatment may take around three months or longer to show measurable effects.
Doctors may recommend a repeat semen analysis after this period to assess changes in sperm quality.
Not all cases of teratospermia can be prevented, particularly those caused by genetic factors or certain medical conditions.
However, avoiding tobacco and recreational drugs, limiting alcohol, maintaining a healthy weight, and seeking timely treatment for reproductive health problems may support sperm quality.
Abnormal sperm shape, or teratospermia, can affect male fertility, but it does not automatically mean infertility. A semen analysis helps identify the problem, while further testing can reveal possible underlying causes.
With appropriate medical guidance, healthy lifestyle habits, and fertility treatments when needed, many couples can explore effective options for achieving pregnancy.
The most important step is to evaluate sperm morphology alongside other fertility factors rather than relying on a single test result.
